Island



(No Model.)

JLMO RTON. LET-OFF MECHANISM FOR LOOMS.

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Patented May 24, 1892.

INVENTUR mws:

NORRIS rrrzns 20., morb-umon WASKINGTO STATES PATENT OFFICE.

JAMES MORTON, OF VALLEY FALLS, ASSIGNOR TO THE GEO. \V. STAFFORDMANUFACTURING COMPANY, OF PROVIDENCE, RHODE ISLAND.

LET-OFF MECHANISM FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 475,595, dated May 24,1892.

Application filed October 2, 1890. Serial No. 366,809. (No model.)Patented in England October 22, 1890, No. 16,865.

To all whom it may concern: The warp-beam shown at O has the gear Be itknown that I, JAMES MORTON, of Valformed on the head thereof orconnected thereley Falls, in the county of Providence and with. Thepinion which engages with the State of Rhode Island, have inventedcertain gear 0 is shown at 19 this pinion being fixed 55 newandusefulImprovementsinLet-OffMechupon the shaft of the gear 13. Into thegear anism for Looms; and I do hereby declare that p meshes the pinion0, which is connected or the following is a full,clear, and exactdescripformed in one with the friction-pulley j, the tion thereof,reference beinghad to the accomsaid pinion and pulley turning togetherupon pan ying drawings, and to the letters and ting the stud e,projecting outward from the lever 60 1o ures of reference markedthereon, which form h. Lever h is pivoted upon the stud 727, made a partof this specification. fast in the loom-frame, and the part thereof Thisinvention (for which I have received adjacent to the stud eis widenedand has piv- Letters Patent in Great Britain, No. 16,865, oted theretotwo pawls w, the points of these dated October 22, 1890) relates to thedevices pawls resting upon and engaging with the 65 I 5 or mechanismswhich are called let-off moreverselydirected ratchetteeth which tionsfor looms, and which are applied to are formed upon the interior ofpulley j. looms for the purpose of regulating the ten- The periphery ofpulley j is grooved at f for sion and the delivery or supply of thewarpthe reception of friction band or strap f, threads during theoperation of weaving. which band or strap passes partly around the 70 Myinvention consists in a novel and imsaid pulley and has the end of itsupper proved construction and combination of the length connected withthe upper arm of a ledevices constitutingalet-off motion for looms, ver1), while the end of the lower length or the same being intended tomaintain an even portion of the band is connected with the rod tensionon the warp during the weaving and d, this rod (1 being at its forwardend con- 75 maintain a proper resistance to the beating nected with thelower arm of lever b. The up of the weft or filling, and also to provideupper length of band or strap f is formed in for the proper delivery ofthe warp from the part of a spring g, which is employed for thewarp-beam as the weaving progresses. purpose of holding the band tightaround the The invention will first be described with pulley j. The rearend of the rod cl is con- 80 reference to the accompanying drawings, andnected to an arm a, projecting downwardly then be particularly pointedout and disfrom the shaft (1. of the whip-roll a, the said tinctlydefined in the claims atthe close of this whip-roll having the wingthereof extended specification. forwardly from the shaft thereof. A pinon In the drawings, Figure 1 is a view in side the lower arm of thelever b enters a slot in 85 elevation of sufficient of a loom having mythe link 0, which is pivoted to the lay-sword invention applied theretoto make clear the B. One end of a stud a (see Fig. 4c) enters acharacter and mode of operation of the latter, hole formed in lever 17and is secured therein parts being removed or broken away to secure byscrew 2. The other end of the said stud clearness. Fig. 2 is a view inside elevation, has a hearing at the inner end of the hollow c partlybroken away, of the friction-pulley and hub of a bracket m, which isbolted to the connected pinion, the supporting-lever, the loom-frame,while at a point adjacent to the pawls carried by the said lever, theholdinglever b the stud has another bearing in abolbracket for the saidlever, and the pivot of the ster if, set in the outer end of the openingin lever. Fig. 3 is a view in horizontal section the hub and securedtherein by a screw '1). 95 on the plane indicated at ca x in Fig. 2.Fig. Within the hub the stud is surrounded by a 4 is a View in section,and Fig. 5 a View in spiral spring 7*, one end of which spring ensideelevation of certain parts which will be ters a notch 3, formed in anenlargement or referred to fully hereinafter. collar 3, formed on theinner end of the stud,

One of the side frames of a loom is shown while the other end of thespring enters a 100 at A in Fig. 1, one of the lay-swords at B, thenotch or slot 4 in the bolster t.

lay rock-shaft at B, and the fiy-wheel at D. The spring 7' acts with atendency to bear thus to act.

m whenever it is necessary toadjustthetenthe lower arm of the lever 1)forward and through. the connections described operates to cause thewhip-roll to bear upward against the warp-yarns passing over the same.At the same time the said spring, in acting to draw the rod d. forward,causes. the lower length or portion of band. f to bed'rawn forward in amanner which causes the teeth to on the interior of the friction-pulleyjto be held firmly against the pointsof. thepawlsww, these latter beingmounted on pivots carried by lever h and serving to prevent rotation ofthe friction-pulley while the spring continues By thisaction upon thefrictionpulley and whip-roll theproper-tensionon thewarp-yarns ismaintained. As the weaving proceeds and the cloth is drawn-forward bythe take-up,, the: strain on the'warp-ya-rns .will. increase andtend to.bear down the whiproll. When the whip roll is depressedflhe, arme.',,rodd,,and lower arm of lever b-will-be. carriedbackwardagainst thetensionof spring '1', and as they are thuscarried backward=the band 1? will bedrawn. upon in a; mannerto cause the firiction-pulley j andconnected imion o-to be rotated, and thesaid. pinion 0 will operate: through: the,gearing described to partly turn the. warp-beamandl'et 01f apolition of.the warp-yarns. This canhappen, however, only when the lay: is: back. inits heat, for when the lay swings. fiorward the. link 6. Willa-ct todrawforward'positively the. lower arm. of lever b,.an;d: thereby" raise the:whip-roll andv hold the friction-pulley from turningby keeping theteeth.to of said; pulley pressed against thepawls w. The bolster t is intendedto be rotatedlinthehub ofi bracket sionofi the spring '2". Forthispurpose. it is provided with. a squared or hexagonal head fittedto-be engaged by a. suitable tool.

When it is desired to adj ustthe. tension'of. thespring, the screw v, bywhich thebolster is clamped in. position in the; hub of bracketm,.is.first loosened, then the-bolsteris turned in the requireddirection,,andfinally screw 0 is tightened again. The objeetin mountingfrictiom-pulleyjand pinion 0 upon lever h is to enable piniono to bedisengaged from gear 19 whenever it is desired to rotate the warpbeam byhand. The free end of the lever is formed as a handle to enable it to beconveniently grasped, and the plate 70', which is af- ,fixed to'theloom-frame, is formed with two notches. It? 70 one. above the other,into either of which the lever may be pressed, so as to hold the leverin either its raised or its depressed and normal position. I claim as myinvention- 1. The combination, with the friction-pulley j and pinion 0connected therewith, a train of gears adapted to be placed in gearconnection 1 with thewarp-beam of a loom, the whip-roll having an arm a,the lay-sword,and the link '0, connected with thetla-y-sword, of thelever b, the rodd', connecting the arm a and the lever.b,rthestraprorband f, passing partly around the; friction-pulley andconnected atits ends with the=saidlleverb and. rod (1, respectively,

the: stud/n, servingas a; pivot for leverband' thespring.r,.sur.rounding: the stud n andhav- .ingone end thereof connectedtherewith, all 3 snbstantiallyas and for. the purposes setforth. 2.. Thecombination,withathefriction-pulley ,j and pinion 0connectedutherewi-th,.atrain' of gears adapted to beplacedjingear'connection {witlrthe warp-beam of. aloom, theiWhip-roll havingan.arm 01/, the; lay-sword, and the link :c,,connected" with the lay-sword,of thelever b, therod d, connecting. the arm a! and the jlever b, the.band: or strap f, passing partly garonnd the firict-iompulley' andconnected: at lits endswith the said lever band the said rod d,respectively,.the stud n, serving as a pivot. for leverb; the spring'r,surrounding I said stud and having oneend connected there- ;with,,andtheadj ust'able bolster t, with which the; other end of the. saidspringis connected, T the said bolster having provisions for holding it insetposition, substantially as andfor the purposes described.

JAMES MORTON.

Witnesses:

GEO. W. STAFFORD, J. A. VICKERY.

